Transmission belt



Ni. O. REEVES.

TRANSMISSION BELT. APPLicATloN FILED 1AN.3,1922

Patented Nov. M9 1922?.

2 SHEETS-SHEET i.

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M. G. REEVES. TRANSMISSIGN BELT. APPLICATIQN FILED MN. a, 1922.

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PatentedNov. 14, i922..

of 'rares than? i lVl'lI/I.'ONl O.. REEVES, OF COLUMBUS, INDIANA., .ASSIGNOR TO 'REEVES PULLEY COMPANY, 0F COLUMBUS, I

NDIANA, A CORORATION.

TRANSMISSION BELT.

Application led January 3 To o?! trimm t may conce/'71.:

Be it known that l, MILTON O. llnnvns, a citizen of the United States, and a resident of Columbus, county of Bartholomew, and State of Indiana, have rinvented a certain new and useful Transmission Belt; and l do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying,r drawings, in which like numerals refer to like parts.

The object of this invention is to prolong the life and usefulness of belts used in speed varying transmissions in which there are two pairs of conical disks with the conical faces of each pair of disks adjacent each. other and between which the belty operates, and by reason of the wedg'ing of the belt between the disks, power 'fill be transmitted to the belt or the belt will transmit power to the disks. The variation in speed in such apparatus depends upon how far the belt is located from the axes of the two pairs of disks, and this distance is predetermined by adjustine; the disks of each pair towards or away from each other.

ln such mechanism the belt is usually wedge-shaped at its sides so as to offer a great surface contact between the disks, and, therefore, cause great friction between them for theeffective transmission of power.

Heretofore, these belts have usually been formed of a continuous flexible belt Abody with keystone-shaped contacting.;` blocks secured to the inner side of the belt body by screws extending through sectional steel plates on the outer surface of the belt body and through the belt body .into the blocks. These screws have been inserted centrally through said steel plates or midvmy between the sides of said plates.

ln the use of the belt heretofore in xnechanism of the kind described, the great strain on the belt causes said blocks to wedge between the conical faces of the disks with tremendousforce so that when a block should leave a pair of disks, it is difficult to release it, wherefore the block lingers and is held too long instead of being released. This causes the belt body to bend or slightly change direction of travel and the outside plates at their advancing edges to buckle lito and sharply engage the belt body at its bending,` point and crystalline the belt at that point and cause Ait soon to weaken and break.

understood from the 1922. Serial ITo. 526,573.

rl`he object of thtl present invention is 'to overcome this difficulty.

The chief feature of this invention ccn- -sists in placing the screws through said ontsidesteel plates near their following edges so that there is more distance between the screws and the advancing edge of a plate, and, therefore, more leverage in the plate, whereby said plate will tend more to travel in the direction of the belt body andv not buckle into the belt body or cause it to bend, and the pull of the belt, acting through. the wide area of the plate and the screws, will cause the latter to give the block a twisting action, when it is ready to leave the disks, and thus release the block sooner than in the construction heretofore used and tend to prevent the advancing edge of the plate burklinp,` into the belt body every time the plate leaves the disks and the consequent bending, wearing and-breakage of the belt body.

Thefull natnfe of the invention will be accompanying drawings and the following,r description and claims:

In the drawings. Fig. l is a plan View of What is known as the Reeves speed varying transmission, parts being broken away. Fig. 21's a View on the line 2-2 of Fig. l, showing thebelt in section and the other` parts in elevation. Fig. 3 is a section on the line 3--3 of Fig. l. F ig. l is a longitudinal central section of the portion. of the belt on an enlarged scale. Fig. 5 is a plan view of a portion of the belt,V parts'being broken away. lfig. 6 is a central longitudinal vertical section of a portion ofthe belt and one of the disks, as the belt is leaving the disks. Fig. 7 is the same as Fig. 6, showing the old form of belt and its action. Fig. 8 is a. plan view of a modified form of the belt.

In the drawings there is guiar frame 10 in Fig. 1 in which two par allel shafts ll and l2 are mounted, one of which is the driving shaft and the other the driven shaft, the ultimate'driving and driven means not being shown. @n each shaft there is mounted a similar pair of cone disks 13 with their conical faces towards each other, and in engagement With which a belt body le operates, said belt being wedgeshaped in cross section. Each of said disks is mounted so as to be slidable longitudinally of its shaft and is splined thereon so shown a rectanshown in Fig. l and parallel therewith.,

There is one pair of said levers'25 on each side of the two pairs of cone disks. Fachl lever is pivotally connected by the screw Q6 with a sleeve, not shown, which is slidable on the shafts l1 and 12in `bearing engagement with the hubs 27 of the disks 13. The levers have extensions 30, whereby they are tulerumed at "3 1 on e. teke-upscreiv rod 32 which is-co-nstructed so es to give the belt the desired tension, and which construction is well'knwn :in this nrt and is .no purt of this invention. The levers 25 are similarly operated for shifting the disks to obtain the desired speed by the screw rod 33 mounted in the frame and looselyfcconneeted with .the ends of vseid levers by ineens 3d projecting through slots 35 in said levers. @This causes simultaneous operation of all-tile levers 25 and adjustment of all lthe disks 13, setlist vwhile one 'pair of disks ere being moved apart, the other pair is being correspondingly moved towards each other, and thereby the position of the belt with relation to the axes of thetwo pairs of cone disks is adjust ed and the speed predetermined. `The foregoing parts of the apparatus are old and well known in the art. T he belt as a whole is formed as shown in Figs. 2., 3, el and 5. Itconsistsof a continuous belt body 15, blocks 16 on the inside to wedge between and frictionelly engage the disks, st il 17 on the outside, and screws 153 extending through the steel plates, belt body, and into the 'wedging blocks 16. "ihe wooden blocks 16ers keystone shape in cross section` as shown in' Fig. 4, sothat they indy'travel aroundthe axis of the cone disks, as shown in Fig. 6. The ends olf said blocks are also beveled, as shown in f2, with the saine Obliquity as the conical feces ef the dirs, and preferably leather faced, that there will be asy much friction es the blocks and the disks.- f v In operation there is a powerful wedginf action of the belt, under the strain put on it, between the two disks, as shown in Fig. 3. F ig. 7l illustrates the action oi? the old 'torinof belt as it leaves the pulley. lt requires e, considerable pull or twisting action on the block as it leaves the disks to release it.

Heretofore the screws 1S have been inserted through the middle of the steel plate 17, as shown in Fig. 7. l'n struction just before the block le was-re vleased from the disks, the advancing edge of the lplete 17 would buckle into the belt body by the pull ofi, the belt, pulling down' on the advancing edge of the plete in en eil'ort to possible lretween `tinuous liexib e belt body,

the use of such constraighten, and the leverage of th'e'plate, as heretotore 1nounted,'\vas'not sufficient to enable the blockl to be unwedged without a considerable strain on the belt body and not until after the belt body had been bent over lie advancing edge of the plate, as shown in 'In this invention the screws 18 are inserted through the plate 17 near the following edge, as shown in Figs. 4 and 5. This places the serewsilS -as fai-,away from the advancing edge of the plate 17 es' possible und the benefit of this is indicated in Fig. 6.' As u block approaches the releasing point on' the lower side of Fig. 6, the pull of the belt body on the relatively wide portionoi the plate 17, between its advancing edge and the screws 18, would twist the block and release it sooner thuan in the construction shown in F ig. 7 and before the beltbody was bent, es shown in Fig. 7, over the advancing edge of the plate. In other words, thebelt can with this improved construction run substenqtially straight es it leaves the cone disks because the block will be sooner released by reason of the increased leverage ol the plate tion or recess 21 in the plate Si() ahead of it. I

This gives the seme leverage betweenthe screw 18 and the advancing edge or' the eX tension 19, as there is in the forni shown in Figs. 5 and G, and yet it enables theplate 20 to be on the whole centrally secured by the screws 18, although. the central screws 18 are in the same position in relation to the lateral edges of the central-'part' ci the plate 20 as the screws 18 are to the lateral edges of the plates in Figs. 5 end 6.- g

The invention claimed is: I f1 l. e." transmission belt of the kind =set forth includin theconibinationwith acon-l wedging' blocks on the inner side of the belt body, .andinet'sl plates on the outer side of the'belt body corresponding with the wedging blocks, of ineens extending through cach of said metal plates near one lateral edge lthereof and through the belt body into the blocks for securing and holding the blocks in place. 2. A transmission belt of `the kind set forth including the combination with a'conmeans extending through each of said metal plates near its following edge and through the belt bod Ainto said Wedging metal blocks for lio ding them in place.

3. A transmission belt of the kind set forth including the combination with :iv oon-v tinuous flexible belt body, Wedging blocks on the inner side of the belt body, and metal plates on the outer side of the belt body correspondin with the Wedging blocks, of mea-ns extending through each of said metal plates as far as possible from the advancing edge thereof and through said belt body into said blocks for securing and holding them in place.

in Witness w-hereoil have heieunto affixed my signature.

NLLTN @n 

